pot marigold vs common marigold

pot marigold and common marigold both are nouns.

Word	Noun	Adjective	Verb	Adverb
pot marigold	Yes	No	No	No
common marigold	Yes	No	No	No

As nouns, pot marigold and common marigold are synonyms defined as:

Other synonyms of pot marigold include Calendula officinalis, ruddles, Scotch marigold.

pot marigold (noun)	common marigold (noun)
the common European annual marigold	the common European annual marigold